Numerical Simulation Of Welding Temperature Field And Stress Field Of T-joint Of Bogie Frame

The welding process is very complicated, which involves aspects of electricity, heat,power, metal phase transition, etc., If we can simulate the welding process accurately by thecomputer, it will be a important significance for the welded structures, material selection,and welding process optimization.Bogie frame is a very important part for bogie, to make the train safe enough, we mustmake sure that the bogie is sufficient strength and stiffness; also, the bogie should haveappropriate elasticity, good impact resistance and fatigue resistance. T-joint is the mainconnector in the bogie, and it is a common connector in welded structures, but the researchfor it in numerical simulation is rarely. In the factory, welding is always used in largestructures, the quantity if the welding structure is direct affect the quantity of the productsand the economic efficiency of enterprises. In this article, we will do some works as follow:1. Establishing the FEM model in Hypermesh. As the material properties will changein different temperature, we should choice different size of grid in different areas. The areasof weld and near weld should choice the small size of grid, and the rest area should choicelager size. Then, we choose the appropriate time step, and the element death and birthtechnology is used in this article.2. We just consider the temperature field and stress, strain field are single couple in thisarticle. The temperature field will be calculated first, and save the result. Then thetemperature result is used as load to calculate welding stress and deformation.3. Analyze the welding temperature field at different time, given the temperaturedistribution of weld centerline in different time. For the stress field, given the stressdistribution at different time, the curve of the transverse stress and longitudinal stress can befound here.